You should have a WeChatPay merchant account before following this tutorial.
If you don't have a merchant account, you should apply for one from the WeChatPay official website.
Contact WeChatPay support directly when you meet some issues.
WeChat Overseas Merchants:
Please click on WeChatPay Global official website.
You can click on Wechat Pay Application Guideline for Merchants to view.
You need to apply for opening Web Payment .
Settlement & Fees from WeChatPay Global official:
Please click on Settlement & Fees to view.
WeChat Pay officially charges 2% of the transaction as a service fee.
请点击 WeChatPay China 官方网站.
您需要申请开通 Native支付、 H5支付、 JSAPI支付.
请点击，查看： 开通微信国内支付商户与Shopify WeChatPay App配置PDF教程.
结算管理: 请点击 结算管理 查看.
You need to input your email address and then verify it, setup your login password and pay password, You will get Mchid and Appid in your mail from WeChatPay.
You need to login to the merchant's account and setup the Apikey. You need to prepare WeChatPay Mchid , Appid and Apikey, follow this tutorial after you get them.
1.Please click on
WeChatPay App, Enter your myshopify.com name and checked Agreed, Then click on "Add This App".
2. Install WeChatPay,Click on "Install unlisted app".
3. Approve charge.
4. Open WeChatPay, Click on "WeChatPay".
Input your WeChatPay AppId、MchId、ApiKey in WeChatPay App and choose the country and currency when you apply, click on "Save Information" .
Then visit your Shopify Store background, Input your Shopify Gateway Key and Gateway Password in Shopify Store background and Save.
Go Through Order Proccess, At checkout step.
You can check your transaction through your WeChatPay App background.